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Bertrandite from
Helen Beryl Mine (Sweepstakes Beryl; Big Tom claim; Kem claim), Fourmile, Custer District, Custer Co., South Dakota, USA

Mineral Species
Species:Bertrandite
Formula:Be4(Si2O7)(OH)2
Description
Comments:Occurs in pegmatite.
Quality of samples:not specified / average specimens
Confirmation
Validity:Believed Valid
References
References:Rocks & Minerals: 60: 117.
Data
Mineral Data:Click here to view Bertrandite data
Locality Data:Click here to view Helen Beryl Mine (Sweepstakes Beryl; Big Tom claim; Kem claim), Fourmile, Custer District, Custer Co., South Dakota, USA
Nearest other occurrences of Bertrandite
28.8km (17.9 miles) A β“˜Dan Patch Mine, Keystone, Keystone District, Pennington Co., South Dakota, USA
29.8km (18.5 miles) B β“˜White Cap Mine (King Mica Mine; Primer lode), Keystone, Keystone District, Pennington Co., South Dakota, USA
Mineral and/or Locality  
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